

pub fn mutability_test() {
    let _immutable_binding = 1;
    let mut mutable_binding = 1;

    println!("修改前: Before mutation: {}", mutable_binding);

    // Ok
    mutable_binding += 1;

    println!("let mut mutable_binding; //可变绑定变量 After mutation: {}", mutable_binding);

    // Error!
    println!("这句是不能的，因为只做了绑定，但没有进行可变绑定：_immutable_binding += 1; //_immutable_binding:{}", _immutable_binding);
    // FIXME ^ Comment out this line
}
